/*
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
 */
package com.zavakid.scala.exercise.chapter14

/**
 * @author zavakid 2013-6-15 下午2:10:22
 * @since 1.0
 */
sealed abstract class BinaryTree // 已经不是 Binary 了...

case class Leaf(value: Int) extends BinaryTree
case class Node(right: BinaryTree*) extends BinaryTree
case class OP_PLUS() extends BinaryTree
case class OP_SUB() extends BinaryTree
case class OP_MULTI() extends BinaryTree